Reiun-ji, Buddhist temple in Yushima, Japan

Reiun-ji is the head temple of the Shingon Reiun-ji school, located in Yushima, Bunkyo, Tokyo. Its main hall, a two-story reinforced-concrete building completed in 1976, houses two Dainichi Nyorai statues representing the Diamond and Womb realms. The temple grounds also contain a main gate and a priests' quarters.

Reiun-ji was founded in 1691 by the Shingon Ritsu prelate Jōgon (1639–1702), who restored several temples in Kawachi before receiving this site in Edo from Shogun Tokugawa Tsunayoshi. In 1694 it became the head temple of Shingon Ritsu for the Kantō region. Its halls burned in the Great Kantō Earthquake and World War II, and the present buildings date from the postwar reconstruction; the temple became independent as the Reiun-ji branch of Shingon in 1947.

Reiun-ji is the head temple of the Shingon Reiun-ji school, founded in 1691 by the precepts master Jōgon. In 1694 it was named head temple of the Shingon Risshū for the eight Kantō provinces, and it received a shuinjō from the Tokugawa shogunate. Its name is written 霊雲寺, "temple of the sacred cloud".

The temple is a short walk from Yushima or Nezu stations and can easily be combined with a tour of the other temples and shrines in the area. The grounds are open to visitors and can be explored on foot without any particular preparation.

The temple's five Important Cultural Properties, including a Kamakura-period Maitreya mandala and sixteen arhat paintings, are not kept on site but deposited at the Tokyo National Museum. The temple also holds five paintings designated tangible cultural properties by Bunkyo Ward, among them a Yakushi triad and a Fudo Myoo with two attendants.